HARDMCQ SINGLEJEE Advanced ChemistryInorganic Chemistryp-Block (group 13 and 14)Achiever Section

The blue coloured mineral ‘Lapis Lazuli’ which is used as a semi-precious stone is a mineral of the following class:

A.sodium alumino silicate✓ Correct

B.zinc cobaltate

C.basic copper carbonate

D.prussian blue

Explanation

It is the mixture of minerals with lazurite as main component. The main chemical formula is 8 4 6 4 1 2 (Na,Ca) (AlSiO ) (S,SO ,Cl) - . It mainly consists of sodium, calcium alumina silicates with sulphur, sul- phate and chloride as anions. The intense blue color is due to the trisulphur radical anion present in this crys- tal.

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